Enhancement of tunnel magnetoresistance in ferromagnet/granular/ferromagnet junction related to the Coulomb blockade effect

Hitoshi Kubota, Yoshiyuki Fukumoto, Siripongsakul Thamrongsing, Yasuo Ando, Terunobu Miyazaki, Chung Yu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We study tunnel magnetoresistance effect in ferromagnet/granular/ferromagnet tunnel junctions in the Coulomb blockade regime. The granular consists of a Al-O/Co/Al-O/Co/Al-O multilayer, which was sputtered sequentially. The magnetoresistance (MR) ratio and the resistance (Rs) of the junction increased with decreasing bias voltage at low temperatures. The MR ratio and Rs were calculated based on the theory proposed by Takahashi and Maekawa [S. Takahashi and S. Mackawa, Phys. Rev. B 90, 1758 (1998)]. Although the variation of these values on bias voltage was different from experimental results, the calculated MR ratio in the Coulomb blockade regime agreed well with the maximum value measured.

Original languageEnglish
Pages (from-to)5212-5214
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 II
Publication statusPublished - 2000 May 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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